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            //ES6允许给函数参数赋值初始值
            //1.形参初始值,具有默认值的参数，一般位置要靠后（潜规则）
            function add(a,b,c=10)
            {
                return a+b+c;
            }
            let result=add(1,2);
            console.log(result);

            //2.与解构赋值结合
            function connect({host="127.0.0.1",username,password,port})
            {
                console.log(host);
                console.log(username);
                console.log(password);
                console.log(port);
            }
            connect({
                username:"root",
                password:"root",
                port:3366
            });
            connect({
                host:"localhost",
                username:"root",
                password:"root",
                port:33
            });
        };
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